I had to make this RESTful api for json request and json response.
When i use this RESTful api for Android application, I learned that i login and get Token from RESTful api, and then that Token is used to post data to RESTful api through Header.

As postman capture,

I must fill "author":"number" on Body. I think this number means that user's registering order on my RESTful api. From above capture, that author is first user of my RESTful api.

If i made author field empty, it returned

{
"author": [
"This field is required."
]
}

How can i fill "author" part automatically using Token (or other way not using Token)?